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U-3 (tàu ngầm Đức) (1935)Thực đơn
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WikiPedia: U-3 (tàu ngầm Đức) (1935) https://uboat.net/boats/u3.htm http://uboat.net/boats/successes/u3.html http://uboat.net/boats/u3.htm https://tools.wmflabs.org/geohack/geohack.php?lang... https://www.google.com/books/edition/Der_U_Boot_Kr... https://www.google.com/books/edition/German_Warshi... https://www.google.com/books/edition/Die_deutschen... http://www.u-boot-archiv.de/dieboote/u0003.html https://www.feldgrau.com/norwegian.html